I know you said your using XFCE, but the recent version of XFCE
switched to gtk3 instead of the old gtk2, which is very GNOME-centric.
I'm not 100% sure but I suppose this could be related. The manual seems
to suggest writing a small lua script to tick the screensavor program
when mpv is running, which should be pretty simple to do even in shell.
Just pgrep mpv (or whatever media player) and check if it returns a
result. [[ -z ${VAR} ]] checks for null strings in bash. If so, tickle
the screensaver.
1 #!/bin/bash
2
3 while true; do
4 mediaPlayerPid = $(pgrep mpv)
5 if [[ -z ${mediaPlayerPid} ]]
6 then
7 /usr/bin/xdg-screensaver
8 fi
9 done
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